MODELLING OF REMOVAL OF DIRECT BLUE 71 AND BRILLIANT GREEN DYE IN FIXED BED COLUMN BY ADSORPTIONSnehal Deshpande, Kavita Kulkarni and Anand Kulkarni
This paper deals with the study of fixed bed column performance for the removal of Direct Blue 71 and Brilliant green dye by using lignite loaded with Azospirillum bacteria. Sterilized lignite was mixed with Azospirillum bacterial culture. Flow rate and bed height was varied to check the adsorption performance. Effect of two parameters was checked. Adsorption efficiency was increased as bed height was increased. But when flow rate was increased, somewhat adsorption was found to be decreased. The optimized condition was investigated at which the bed capacity was maximum. The maximum adsorption capacity was 0.4722 mg/g for 11 ml/min flow rate and 80 cm bed height. Adsorbent capacity at a breakthrough was 87.699 kg/ m3. The adsorbent capacity at equilibrium was 92.5715 kg/m3. Unused bed length of column at breakthrough was 0.0421 m. Various models were studied to check the agreement of the experimental data to the predicted models. Predicted and experimental results were found to be in good agreement. Mecklenburg, Wheeler and Yoon models was suitable for the experimental data. The experimental values suggested that the column adsorption system by using lignite loaded with Azospirillum bacteria is effective.